Protective helmet



FIG. 1 is a right-side view of a protective helmet showing our newdesign;

FIG. 2 is a left-side view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a top, front and right-side view thereof;

FIG. 8 is a bottom, rear and right-side view thereof; and,

FIG. 9 is another right-side view thereof, the only difference residingin the removal of the broken line detail on the face shield in FIG. 1.

The details shown in broken lines in FIGS. 1-9 form no part of theclaimed design.

We claim the ornamental design for a protective helmet, as shown anddescribed.